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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e069d3af2cea57c1382aedce928216fe8933f91fe49175bb826084b84dfbdd' 
  AND token = 'dN4YeYw3ugKQD1+Xqc+4mHKdhXr1qwr8dt+pTxt8ZgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}